National Highway 31 (NH 31) is a major roadway in India that connects the northeastern states to the rest of the country. It runs through several important cities, including Guwahati in Assam and Kolkata in West Bengal, facilitating trade and travel in the region. The highway plays a crucial role in linking various economic and cultural hubs. The highway spans approximately 1,200 kilometers and is part of the larger network of national highways in India. It is essential for the movement of goods and people, contributing to the economic development of the northeastern states and enhancing connectivity with other parts of the country.